Another question often asked about The Ancient Ones' star ships was could their sensors detect things as far away as the fictional ships on television do?
The answer, I'm afraid, is no. The ordinary sensors were virtually useless at high speed. A completely different sensing system had to be brought into use.
As a ship travels faster than the speed of light it begins to generate hyperwaves that radiate out from it hundreds of times faster than it, itself is travelling. When these hyperwaves meet another object they bounce off in all directions, some of them going back in the direction they came from.
By having a separate sensor grid on the outside of the ship that could detect hyperwaves these return waves could be detected and processed into images. They weren't as clear as the images created by the other sensor systems, but they were good enough that they could provide the navigator with necessary information to keep the ship on course and away from any danger.
As no two hyperwaves were never exactly the same, it could also be detected if the hyperwaves were from your own ship, or, from another. Thus the course and speed of other ships could also be plotted, and sometimes even the types of engines that they were using determined.
No, our sensors weren't like those on the fictional TV shows, but they worked! They got the job done. Without them space travel would have been impossible.